import router from './router'
import store from './store'
import NProgress from 'nprogress' // Progress 进度条
import 'nprogress/nprogress.css' // Progress 进度条样式
import {
    Message
} from 'element-ui'
import {
    getAuth
} from '@/utils/auth' // 验权

let loadAsyncRouter = false
const whiteList = ['/login'] // 不重定向白名单
router.beforeEach((to, from, next) => {
    localStorage.setItem("routerBefore", from.path)
    NProgress.start()
    /** 请求头包含授权信息 并且 页面必须授权 直接进入 */
    if (getAuth()) {
        if (to.path === '/login') {
            next({
                path: '/'
            })
            NProgress.done()
        } else {
            if (!loadAsyncRouter) { // 判断当前用户是否获取权限
                loadAsyncRouter = true
                if (store.getters.allAuth) {
                    store.dispatch('GenerateRoutes', store.getters.allAuth).then(() => { // 根据auths权限生成可访问的路由表
                        router.addRoutes(store.getters.addRouters) // 动态添加可访问路由表
                        if (to.path === '/404') {
                            next({
                                path: to.redirectedFrom || '/',
                                replace: true
                            })
                        } else {
                            next({
                                ...to,
                                replace: true
                            })
                        }
                    })
                } else {
                    store.dispatch('getAuth').then(res => { // 拉取user_info
                        const auths = res.data
                        store.dispatch('GenerateRoutes', auths).then(() => { // 根据auths权限生成可访问的路由表
                            router.addRoutes(store.getters.addRouters) // 动态添加可访问路由表
                            if (to.path === '/404') {
                                next({
                                    path: to.redirectedFrom || '/',
                                    replace: true
                                })
                            } else {
                                next({
                                    ...to,
                                    replace: true
                                })
                            }
                        })
                    }).catch((err) => {
                        loadAsyncRouter = false
                        store.dispatch('LogOut').then(() => {
                            Message.error(err.error || '获取用户信息失败')
                            next({
                                path: '/'
                            })
                        })
                    })
                }

            } else {
                next()
            }
        }
    } else {
        if (whiteList.indexOf(to.path) !== -1) {
            next()
        } else {
            next(`/login?redirect=${to.path}`) // 否则全部重定向到登录页
            NProgress.done()
        }
    }
})

router.afterEach(() => {
    NProgress.done() // 结束Progress
})

router.onError((error) => {
    const pattern = /Loading chunk (\d)+ failed/g
    const isChunkLoadFailed = error.message.match(pattern)
    const targetPath = router.history.pending.fullPath
    if (isChunkLoadFailed) {
        router.replace(targetPath)
    }
})